Precision Agriculture

, Volume 5, Issue 6, pp 565–577 | Cite as

Within-field Variations in Grain Protein Content—Relationships to Yield and Soil Nitrogen and Consistency in Maps Between Years



In uniformly managed fields, high yielding areas and areas with less plant-available soil nitrogen (Np) may have lower grain crude protein concentration (CP) due to smaller amounts of nitrogen available per kg grain yield. With site-specific fertilization, more nitrogen could be applied to such areas to achieve a better and more even CP within the field. To investigate the need for this and the possibility of estimating fertilizer demand from historical data, within-field variations in CP, correlations with yield and Np and their consistency in spatial distribution between years were investigated. Measurements were performed during 1998–2000 at 34 sites within a 15-ha field in southwestern Sweden. Winter wheat (Triticum aestivum) was grown in 1998 and 2000 and spring barley (Hordeum vulgare) in 1999. CP was dependent on both yield and Np, but was also affected by other factors. The spatial distributions of CP and grain yields within the field were not consistent between years, probably because fertilization relative to optimum varied differently between sites in different years. In 1998, CP and grain yield were negatively correlated and CP was larger at sites with more Np. CP had a positive correlation with both yield and Np in 1999. In 2000, CP was lower where yield was higher at most sites, but did not correlate significantly with either yield or Np. The positive correlation between yield and CP was connected with nitrogen fertilization below optimum, whereas the negative correlation was connected with nitrogen fertilization near or above optimum at most sites.


cereal grain yield nitrogen protein site-specific farming 


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  1. Algerbo, P. A. and Thylén, L. 1999. Variable nitrogen application: effects on crop yield and quality. In: Proceedings of the Fourth International Conference on Precision Agriculture, edited by P. C. Robert, R. H. Rust and W. E. Larson (American Society of Agronomy, Crop Science of America, Soil Science of America, Madison, Wisconsin, USA), pp. 709–717. Google Scholar
  2. Bremner, J. M.,  et al. 1965Total nitrogenBlack, C.A. eds. Methods of Soil Analysis, Part 2American Society of AgronomyMadison, Wisconsin, USA11491178Google Scholar
  3. Burrough, P. A., McDonell, R. A. 1998Principles of Geographical Information Systems. Spatial Information Systems and GeostatisticsOxford University PressNew York, NYp. 333Google Scholar
  4. Delin, S., Lindén, B. 2004Relations between net nitrogen mineralization and soil characteristics within an arable fieldActa Agric. Scand. Sect. B, Soil and Plant Sci.527885Google Scholar
  5. Delin, S., Lindén, B. and Berglund, K. 2004. Yield and protein response to fertilizer nitrogen in different parts of a cereal field: potential of site-specific fertilization. Europ. J. Agronomy, in press. Google Scholar
  6. Delin, S., Söderström, M. 2002Performance of soil electrical conductivity and different methods for mapping soil data from a small datasetActa Agric. Scand. Sect. B, Soil and Plant Sci.52127135Google Scholar
  7. Gee, G. W., Bauder, J. W. 1986Particle-size analysisKlute, A. eds. Methods of Soil Analysis, Part 1. Physical and Mineralogical MethodsAmerican Society of AgronomyMadison, Wisconsin, USA383411Google Scholar
  8. Gooding, M. J., Salahi, M. and Ellis, R. H. 1999. Spatial variation in the response of wheat grain yield and quality to late nitrogen. In: Precision Agriculture ’99: Proceedings of the 2nd European Conference on Precision Agriculture, edited by J. V. Stafford (Sheffield Academic Press, Sheffield, UK), pp. 531–538. Google Scholar
  9. Gooding, M. J., Davies, P. D. 1997Wheat Production and Utilization, Systems, Quality and the EnvironmentCAB InternationalWallingford, UKp. 355.Google Scholar
  10. Hansson, A.-C., Pettersson, R., Paustian, K. 1987Shoot and root production and nitrogen uptake in barley, with and without nitrogen fertilizationZ. Acker Pflanzenb.158163171Google Scholar
  11. Reyns, P., De Baerdemaeker, J. and Ramon, H. 1999. Site-specific relationship between grain quality and yield. In: Precision Agriculture ’99: Proceedings of the 2nd European Conference on Precision Agriculture, edited by J. V. Stafford (Sheffield Academic Press, Sheffield, UK), pp. 665–676. Google Scholar
  12. Sosulski, F. W., Imafidon, G. I. 1990Amino acid composition and nitrogen-to-protein conversion factors for animal and plant foodsJ. Agric. Food Chem.3813511356Google Scholar
  13. Spiertz, J. H. J. 1974Grain growth and distribution of dry matter in the wheat plant as influenced by temperature, light energy and ear sizeNeth. J. Agric. Sci.22207220Google Scholar
  14. Stewart, C. M., McBratney, A. B., Skerritt, J. H. 2002Site-specific Durum Wheat quality and its relationship to soil properties in a single field in northern New South WalesPrecision Agriculture3155168Google Scholar

Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  1. 1.Department of Soil SciencesDivision of Precision AgricultureSkaraSweden

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